Nut-lock.



No. 769,717. PATENTED SEPT. 13, 1904.

IIIIIIIIIIIIIIIIIIIIIIIIII 3.

N 0 M O D E L.

CATHARINE RYAN, OF

\ NUT- Patented. September 13, 1904.

PATENT OFFICE.

ST. PAUL, MINNESOTA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 769,717, datedSeptember 13, 1904.. Application filed November 20, 1903. Serial No.181,909. (No model.)

To (all whom it UZ/KLZ/ concern.-

Be it known that I, (JATHARINE RYAN, a citizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented certain new and useful Improvements in Nut-Locks, of whichthe following is a specification.

My invention relates to improvements in nut-locks, its object being toprovide means for preventing the nut from becoming loose from the bolt.

In the accompanying drawings, forming part of this specification, Figure1 is a view of a bolt and nut embodying my invention, the nut beingshown in section; and Fig. 2 is a detail of the nut.

In the drawings, A represents the bolt, having a threaded end 2. Thethread 3, as shown, is cut to a greater depth toward the ends of thethreaded portion than at the center, the entire outer edge of the threadbeing equidistant from the center of the bolt. upon the bolt is a nut 4,having an interior thread 5, intermeshing with the thread of the bolt.The nut is formed upon one side with a split 6. As the nut travels overthe center of the threaded portion the nut will be expanded by theshallower part of the thread, and as it is carried to the inner end ofthe threaded portion the deepening of the thread will allow the nut tocontract, this being permitted by the split 6. By having the outer edgeof the entire thread equidistant from the center of the bolt loosenessof the boltin any Threaded part through which it passes is prevented. Ifthe entire edge of the thread was not equidistant from the center, theopening in a fishplate or other part through which the bolt might passwould have to be as large as the diameter of the bolt in the center, andconsoquently much larger than the diameter at the inner end of thethreaded portion, causing looseness.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In combination, a threaded bolt, the thread being cut deepest towardthe ends of the threaded portion of the bolt, the entire outer edge ofthe thread being equidistant from the center of the bolt, and a splitnut formed with an inner thread arranged to engage with saidbolt-thread, the nut-thread being deeper than the shallowest portion ofthe bolt-thread.

2. In combination, a threaded bolt and a split nut formed with a threadarranged to engage with said bolt-thread, said bolt-thread being cutshallowest intermediate of its ends, and the thread of said nut beingdeeper than the shallowest portion of the bolt-thread to cause spreadingof said nut.

In testimony whereof I aflix my signature in presence of two witnesses.

CATHARINE RYAN.

\Vitnesses:

H. S. JOHNSON, EMILY F. OTIS.

